Factors associated with low vitamin D status of Australian alpacas

Objective To investigate factors associated with low vitamin D status of alpacas at pasture in southern Australia.

Design A 2-year survey of alpacas from two farms in South Australia and three in Victoria. Blood samples were collected from 20 to 30 alpacas on each farm on five occasions each year. Breed, gender, age and fleece colour of animals were recorded.

Method Blood samples were assayed for plasma 2.5-hydroxycholecalciferol (25-OH D3) and plasma inorganic phosphorus (Pi). Data sets from 802 animal samples were analysed by multiple regression to determine variables associated with low vitamin D status of alpacas. The relationship between plasma 25-OH D3 and plasma Pi was also investigated.

Results Vitamin D status was significantly affected by month of sampling, with low values in late winter and high values in summer. Plasma vitamin D concentrations increased with age, were higher in alpacas with light fleeces than in those with dark fleeces and were also higher in the Suri than in the Huacaya breed. Plasma Pi concentrations were generally lower in alpacas with plasma 25-OH D3 values < 25 nmol/L.

Conclusions Young alpacas with dark fleeces are most at risk from vitamin D insufficiency in late winter in southern Australia. The present study indicates that plasma Pi values are not a reliable indicator of vitamin D status of alpacas as assessed by plasma 25-OH D3 concentrations.

Sources of variation in fibre diameter attributes of Australian alpacas and implications for fleece evaluation and animal selection

Sources of variation in fibre diameter attributes of Australian alpacas and implications for fleece evaluation and animal selection were investigated using data collected in the years 1994–97, from 6 properties in southern Australia. Data were analysed using REML (multiple regression analysis) to determine the effect on mean fibre diameter (MFD) and coefficient of variation of MFD (CV(FD)) of age, origin (property), sex (entire male, female), breed (Huacaya, Suri), liveweight, fibre colour, individual, and interactions of these effects. The mean (n = 100) age (range) was 4.2 years (0.1–11.9), liveweight 72.0 kg (12.0–134 kg), MFD 29.1 μm (17.7–46.6 μm), CV(FD) 24.33% (15.0–36.7%).

A number of variables affected MFD and CV(FD). MFD increased to 7.5 years of age, and correlations between MFD at 1.5 and 2 years of age with the MFD at older ages were much higher than correlations at younger ages. Fibre diameter 'blowout' (increase with age) was positively correlated with the actual MFD at ages 2 years and older. There were important effects of farm, and these effects differed with year and shearing age. Suris were coarser than Huacayas with the effect reducing with increased liveweight; there was no effect of sex. Fleeces of light shade were 1 μm finer than dark fleeces. CV(FD) declined rapidly between birth and 2 years of age, reaching a minimum at about 4 years of age and then increasing; however, CV(FD) measurements on young animals were very poor predictors of CV(FD) at older ages, and the response of CV(FD) to age differed with farm and year. Suris had a higher CV(FD) than Huacayas on most properties, and MFD, liveweight, and sex did not affect CV(FD). Fleeces of dark shade had higher CV(FD) than fleeces of light shade in 2 of the years. It is concluded that there are large opportunities to improve the MFD and CV(FD) of alpaca fibre through selection and breeding. The potential benefit is greatest from reducing the MFD and CV(FD) of fibre from older alpacas, through reducing the between-animal variation in MFD and CV(FD). Sampling alpacas at ages <2 years is likely to substantially decrease selection efficiency for lifetime fibre diameter attributes.

Supply chain management security : the weak link of Australian critical infrastructure protection

Secure management of Australia’s commercial Critical Infrastructure presents ongoing challenges to both the owners of this infrastructure as well as to the Australian Federal government. The security management process is currently managed through high-level information sharing via collaboration, but does this situation suit the commercial sector? One of the issues facing Australia is that the majority of critical infrastructure resides under the control of the business sector and certain aspects such of the critical infrastructure such as Supply Chain Management (SCM) systems are distributed entities that span a number of commercial organisations. Another issue is that these SCM systems can be used for the transportation of varied items, such as retail items or food. This paper will explore the security issue related to food SCM systems and their relationship to critical infrastructure. The paper will focuses upon the security and risk issues associated with SCM system protection within the realms of critical infrastructure protection. The paper will review the security standard ISO 28000 - Supply Chain Security Management Standard. The paper will propose a new conceptual security risk analysis approach that will form the basis of a future Security Risk Analysis approach. This new approach will be aimed at protecting SCM systems.

Diverse approaches : a study of Australian journalism educators' use of web-based curriculum modules for reporting cultural difference

The Reporting Diversity website provides four curriculum modules to assist journalism educators to teach students about the issues and practice of reporting on cultural difference. The researchers co-ordinated the second round of trials of these resources in 2009, which involved the participation of academics and students from five Australian universities. A further 30 academics were surveyed to gauge their level of awareness of the materials. This paper reports on the educators’ evaluation of the resources and reveals the innovative ways in which the modules are being used and adapted in different classroom settings. The researchers argue that sharing different teaching approaches to the materials through the Reporting Diversity website would assist other academics to adapt the resources for their own use.

The story of Australian agricultural economics 1900-1975

The growth of the agricultural economics profession in Australia is evaluated within the context of government policy. Particular economists and agricultural economists were instrumental in questioning the government's policy approach to agriculture. Their life work is assessed to ascertain their legacy to this country through their research, teaching and writing.

Effectiveness of Liechtenstein entities to prevent the application of Australian income tax attribution regimes

Analyses the most common structures of Liechtenstein. The Anstalt, Stiftung, Trust, Business Trust and Company are described and the taxation consequences for an Australian investor considered. The analysis covers the CFC, FIF, transferor trust, deemed entitlement and anti-avoidance rules in Australian income tax law.

Study on dehairing of Australian cashmere fibres

Dehairing is the process that removes coarse hair and other impurities from a cashmere fleece in order to obtain luxury fine cashmere fibres. This study has examined and optimised the machine settings on a locally produced cashmere dehairing unit which has led to improvement in the quality of dehaired cashmere fibres. The improved dehairing unit is now in commercial use, adding significant value to the local cashmere industry.

Earnings management and the performance of Australian IPOs

This thesis examines earnings management in the Australian initial public offering (IPO) market. In general, the results show that Australian IPO firms do engage in earnings management at the offer date. There is sufficienct evidence to suggest that firms that manage earnings at the offer date suffer poorer long-run performance.

Study of Australian alpaca fibres

This work represents the first systematic study on the properties and processing performance of Australian alpaca fibres. The resistance to compression behaviour of alpaca fibres was found to differ considerably from that of wool. A new technique has been developed to objectively measure the softness of fibres. The bleaching and dyeing behaviour of alpaca fibres has also been examined.

Molecular analysis of Australian Newcastle disease virus isolates

The results presented demonstrate that outbreaks of virulent Newcastle disease in Australia arose from the emergence of virulent virus from an endemic avirulent quasispecies. Environmental selection pressures, or industrial practices, led to the emergence of this species and its dominance in several distinct ourbreaks from 1998-2002.

Turning points and transitions : experiences of young women with Type 1 diabetes

This research explores young women with Type 1 diabetes' perspectives of the problems and how they manage them when facing turning points and making life transitions. The study presents a substantive theory of how the women tried to minimise the grip of blood glucose levels felt during transitions by creating stability in their lives.

The shifting ground and context of Australian multiculturalism

The thesis argues against positivistic accounts of multiculturalism's continuing failure to secure popular acceptance, suggesting that a comprehensive understanding of this phenomenon must take account of both changes in the theoretical or normative content of its formal policy texts and a range of contextual factors.